Re: unable to call a function

On 07/04/2013 10:14 AM, giozh wrote:
> something gone wrong the same...
>
> REATE OR REPLACE FUNCTION check_if_if_exist(id integer, table_name
> character, table_column character)
>    RETURNS boolean AS
> $BODY$
>
> DECLARE res BOOLEAN;
>
> BEGIN
>     EXECUTE 'SELECT EXISTS(SELECT * FROM'||table_name||
>         'WHERE'||table_column||'='||$1||')' INTO res USING id;
>     RETURN res;
> END;
>
> select check_if_exist(10, 'prova', 'identificatore');
>
>
> RROR:  function check_if_exist(integer, unknown, unknown) does not exist
> LINE 1: select check_if_exist(10, 'prova', 'identificatore');
>                 ^
> HINT:  No function matches the given name and argument types. You might need
> to add explicit type casts.
>

Not sure if there is a cut and paste error involved but the function
should be something like:

CREATE OR REPLACE FUNCTION utility.check_if_if_exist(id integer,
table_name character, table_column character)
  RETURNS boolean
  LANGUAGE plpgsql
AS $BODY$

DECLARE res BOOLEAN;

BEGIN
     EXECUTE 'SELECT EXISTS(SELECT * FROM '||table_name||
         ' WHERE '||table_column||'='||$1||')' INTO res USING id;
     RETURN res;
END;
$BODY$;

I also put in some spaces to make the query work.


--
Adrian Klaver
adrian.klaver@gmail.com